Laserfiche WebLink
STATE OF CALIFORNIA-Enviro-mental Protection*yency PETE WILSON, Govemor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> �" HEAL Tit <br /> CENTRAL VALLEY REGION RVJCE C0 <br /> e A <br /> Sacramento,CA 95827-3098 Routier Road, <br /> . <br /> PHONE:(916)255-3000 AN dfl= 47 <br /> FAX:(916)255-3015m <br /> 28 November 1995 <br /> Mr. Nathan Esformes <br /> Triple E Produce <br /> P.O. Box 239 <br /> Tracy, CA 95378 <br /> ASSESSMENT OF CONTAMINATION NORTH OF MW-7 AT TRIPLE E PROD UCE, TRACY, <br /> SAN JOAQUIN COUNTY <br /> I have reviewed the 6 September 1995 report entitled Assessment of Contamination North ofMW--7 <br /> submitted by Condor Earth Technologies, Inc. (Condor) for the Triple E facility in Tracy. The report is <br /> in response to my 31 July 1995 letter in which I requested information on other potential sources of <br /> chloroform and on domestic and community water supplies north of Triple E. I also have reviewed the <br /> 9 October 1995 letter which assesses the cost of extracting ground water from MW-7, and the 12 <br /> October 1995 letter which is an addendum to the revised work plan. <br /> ASSESSMENT OF CONTAMINATION NORTH OF MW-7 <br /> Triple E has suggested delaying characterization of chloroform downgradient (north) of MW-7 because <br /> ". . . the chloroform concentrations in MW-7 are still within the range of chloroform from other <br /> potential sources in the area . . ." and because Condor believed the domestic wells north of MW-7 were <br /> no longer being used, and these residents were now using a chlorinated community water supply. <br /> Additional Potential Sources of Chloroform <br /> Swimming Pools <br /> The report discusses swimming pools and septic tanks as additional potential sources of chloroform in <br /> the ground water downgradient of MW-7. The report identifies 32 swimming pools within 3,100 feet <br /> north of MW-7, 14 of which are within 1,200 feet of MW-7. The report presents analytical data from <br /> two swimming pools in the area north of MW-7. One pool approximately 500 feet northwest of MW-7 <br /> contained 15.9 ppb chloroform, while another pool approximately 4,000 feet northeast of MW-7 <br /> contained 8.7 ppb chloroform. <br /> The report also includes copies of a July/August 1993 University of Modena, Italy report entitled <br /> Chloroform in Alveolar Air of Individuals Attending Indoor Swimming Pools and a 7 February 1994 <br /> Department of Health Services (DHS) report entitled Special Report: Use of Swimming Pools for <br /> Emergency Drinking Water. The July/August 1993 report presents analytical data showing chloroform <br /> ranged from 19 to 94 ppb in eight sampling sessions at two indoor swimming pools. The DHS report <br /> presents analytical data from 10 public swimming pools in Los Angeles County in which chloroform <br /> averaged 51 ppb, with a maximum concentration of 130 ppb. The report does not state whether these <br /> pools were indoor or outdoor pools. <br />